igii NAUTILUS SUBCARINATUS 23c 



Comparable Species 



Am. subcarinatus ; Phillips, 1829, xiii, 3. 



Am. sabinus, d'Orbigny, 1850 p. 247 (teste Bonarelli). 



Am. venantii, Catullo, 1853, in, 3 (teste Bonarelli). 



Am. subcarinatus ; Oppel, 1862, xnv, i, 2. 



Phylloceras subcarinatum ; Wright 1884, lxxxi, i — 3. 



Frechiella subcarinaia ; Prinz, 1904, 11, i. 



F. subcarinata, var. truncata, Prinz, 1904, 11, 2. 



F. curvata, Prinz, 1904, 11, 3. 



F. subcarinata ; Parisch & Viale, 1906, vii, 5 — 7. 



